Uploaded a zip of jpg that show the problem. THe first five are normal, rotating around an object constant speed (the object in actually in the tunnel, so you may not be able to see it). Then the next three show the problem, still rotating around constant speed:
Turns out the zip was just a tad too big for me to attach it here (1075 KB....sooo close). So I attapted to upload it here:
http://rapidshare.com/files/72503810/DebugScreenShot_ShaderCorruption.zip.htmlHope you can see it
Oh....I was able to attach the .fx file here though, so see if the problem does indeed occur.